|  |  | Pushes a user error message onto the error command stack.
 
 
   ERR errmsg 
The ERR command is typically used within user defined macros. 
 
  errmsgThe error message that is to be pushed onto the error stack. This
      message must be entered as a string expression (that is, a quoted string
      literal, a string function or macro result). 
 
   $nmdat > err "Illegal negative parameter value"
Push a custom user error message onto the error stack. The error stack is implemented as a ring, with a total of 10 elements.
    
Note that the ERROR environment variable is not set by this command.
 
 
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